Lifting-jack.



No. 721,439. PATENTED FEB. 24, 1903.

J. T. HASKIN.

LIFTING JACK.

APPLICATION IILED APR. 15, 1902. no MoimL.

UNITED STATES PATENT OFFICE.

JOHNT. HASKIN, OFMCKEES ROCKS, PENNSYLVANIA.

. LlFTlNG-JAC K.

SPECIFICATION forming part of Letters Patent N 0. 721,439, datedFebruary 24, 1903.

I Application filed April 15,1902. Serial No. 102,962. (No model.)

To all whom it may concern:

Be it known that I, JOHN T. HASKIN, a citizen of the United States ofAmerica, residing at McKees Rocks,in the county of Allegheny and Stateof Pennsylvania, have invented certain newand useful Improvements inLifting-Jacks, of which the following is a specification, referencebeing had therein to the accompanying drawings. I

This invention relates to certain new and useful improvements in jacks,and. has for its object to provide a jack which will have great liftingpower and one wherein its construction is of that nature as to make thesame applicable to street-cars, vehicles, and the like.

Another object of my invention is to provide a lifting-jack which can beeasily manipulated and one wherein the leverage is suflicient for aperson to lift a great weight.

Another object of my invention is to'provide a jack which will beextremely simple in construction, strong, durable, comparativelyinexpensive to manufacture, and one which will be portable.

With the above and other objects in view the invention consists in thenovel construction, combination, and arrangement of parts to behereinafter more fully described, and specifically pointed out in theclaims.

In describing the invention in detail reference is had to theaccompanying drawings, forming a part of this specification, and whereinlike numerals of reference indicate like parts throughout the severalviews, in which- Figure 1 is a side elevation of my improvedlifting-jack. Fig.2 is a front View of the same. Fig. 3 is a detail viewof the bifurcated member which carries the operating-handle.

In the drawings the reference-numeral 1 indicates the base of myimproved liftingjack, and 2 indicates a vertical standard carried by thebase 1. The standard 2 and the which is secured the bifurcated end 10 ofthe lever 11, said lever carrying a head 12, which in turn carries a pin14, said pin operating in a slot 15, carried by the side of the casing,as indicated at 16, of the vertical standard 2.

The reference-numeral17 indicates a bifurcated member, which has formedintegral therewith a collar 18, whichcarries an operating-handle. (Notshown in the drawings.) Formed upon the rear face of thisbifurcatedportion 17 are lugs 19, said lugs carrying slots '20, in which operatethe pins 9, carried by the lever 8. It will be noted that the connectionof these levers forinsa toggle-joint, the operation of which will behereinafter described.

Reference-numeral 21 indicates an enlarged portion forming lugs whichare carried by the casing of the standard 2, and the reference numeral22 indicates a pin carried by the lugs 21, said pin carrying aneccentric 23, the outer end of the pin carrying an operatinghandle 24.

The reference-numeral 25 indicates a slot carried by thelugs 21, and insaid slot is located a pin 26, said pin carrying a pawl 27, whichengages the teeth of the rack 3. The

standard 2 has its upper end open, as indicated at 28, and also carriesthe aperture'29, through which operates the head 12 of the lever 11,said head engaging the teeth of the rack.

The reference-nu meral 30 indicates another enlarged portion carried bythe casing of the vertical standard 2, said enlarged portion havingformed integral with it pins 31, upon which is pivoted the bifurcatedends 32 of the member 17. v y

The operation of my improved jack is as follows: The claw 5 of the rack3 having been placed under the weight to be lifted, the member 18,carrying the operating lover or handle, is moved outwardly from thevertical standard 2, thus causing the pin 14:,carried by the head of thelever 11, to pass to the base of the slot 15, thus allowing the head 12to engage the teeth of the rack, and when the levers are forced inwardlyby a downward pressure of the handle the rack 3 will be raised. Thismovement is accomplished by the mem ber 17 being pivotally secured at 31and carrying the slot 20, in which is pivotally mounted the ends of thelevers 8 and 11. If it is desired to hold or lock the rack in thisposition, the same is accomplished by means of the eccentric 23, whichis operated by means of the handle 24:, this eccentric bearing against 5the base of the pawl 27, which forces the pawl upwardly and inengagement with one of the teeth carried by the rack. If it is desiredto release the same, the lever 24 is thrown downwardly, thus allowingthe pawl to move down- :0 wardly, said pawl being guided in its movementby the pin 26, operating in the slot 25.

It will be noted that my improved liftingjack may be applicable tostreet-cars and the like, and in using it for this purpose I employmeans for securing my improved jack to the framework of the truck, theoperating-handle of the jack being placed in a suitable position whichwill not interfere with the occupancy of the car by the passengers.

The many advantages obtained by the use of my improved device will bereadily apparent from the foregoing description, taken in connectionwith the accompanying drawings.

It will be noted that various changes may 25 be made in the details ofconstruction with out departing from the general spirit of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters 0 Patent, is

1. In a device of the type set forth, a casing having a rack operatingtherein with a claw on one end of the rack disposed opposite to theteeth of the rack, and a head on the upper end of the rack, a leverpivoted at its lower end to the casing, a second lever pivoted to thefirst-named one and carrying a head engaging the teeth of the rack, ameans for limiting the vertical and horizontal move ment of thesecond-named lever, an operating means comprising a bifurcated memberpivoted at its upper end to the casing and to i the said levers, attheir point of pivot for moving the levers outward from the rack, saidmember being operated upwardly to engage the head of the second leverwith the teeth of the rack and then downwardly, to actuate the rack, andmeans for locking the rack in a predetermined position.

2. In a device of the type set forth, the combination with a casing, ofa rack mounted therein, a lever pivoted to the lower portion of thecasing, a second lever carrying a head engaging the teeth of the rack,with a pin carried by the second lever, operating in a vertical slotprovided therefor in the sides of the casing, an operating meanscomprising a bifurcated member pivoted at its upper portion to thecasing and having vertical slots therein, with a means pivotallysecuring the said levers together and extending in said lastnamed slots,an enlarged portion at the upper end of the casing, with a pawl carryinga pin operating therein, said enlarged portion having vertical slotstherein into which extends said pin, and a means for actuating said pawlupwardly to lock the same in engagement with the teeth of the rack-bar.

In testimony whereof I affix my signature in the presence of twowitnesses.

JOHN T. HASKIY.

\Vitnesses:

JOHN NOLAND, E. E. POTTER.

